#include <iostream>
#include <vector>
#include <string>

#include <glad/glad.h>
#include <GLFW/glfw3.h>

void framebufferSizeCallback(GLFWwindow* window, int width, int height){
    glViewport(0, 0, width, height);
    return;
}

void processInput(GLFWwindow* window){
    if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS){
        glfwSetWindowShouldClose(window, true);
    }
    return;
}

int main(){    
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
    if(window == NULL){
        std::cout << "Failed to create GLFW window." << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    
    if(!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){
        std::cout << "Failed to initialize GLAD." << std::endl;
        return -1;
    }

    glViewport(0, 0, 800, 600);
    glfwSetFramebufferSizeCallback(window, framebufferSizeCallback);

    while(!glfwWindowShouldClose(window)){
        processInput(window);
        
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}